Replace individual list elements in Haskell?

Question

I have a list of elements and I wish to update them:

from this: [\"Off\",\"Off\",\"Off\",\"Off\"]

to this: [\"Off\",\"Off\",\"On\",\"Off\

Answer 1

Here is a one liner that works perfectly

replace pos newVal list = take pos list ++ newVal : drop (pos+1) list

I doesn't seem efficient to do this kind of things in haskell.